Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
  • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
  • F16C19/34—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load
  • F16C19/36—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers
  • F16C19/364—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for both radial and axial load with a single row of rollers with tapered rollers, i.e. rollers having essentially the shape of a truncated cone
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
  • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
  • F16C19/225—Details of the ribs supporting the end of the rollers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
  • F16C23/06—Ball or roller bearings
  • F16C23/08—Ball or roller bearings self-adjusting
  • F16C23/088—Ball or roller bearings self-adjusting by means of crowning
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/30—Parts of ball or roller bearings
  • F16C33/34—Rollers; Needles
  • F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
  • F16C33/366—Tapered rollers, i.e. rollers generally shaped as truncated cones
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/30—Parts of ball or roller bearings
  • F16C33/58—Raceways; Race rings
  • F16C33/583—Details of specific parts of races
  • F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
  • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
  • F16C2240/50—Crowning, e.g. crowning height or crowning radius
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C2361/00—Apparatus or articles in engineering in general
  • F16C2361/61—Toothed gear systems, e.g. support of pinion shafts

Definitions

• the present invention relates to a tapered roller bearing used in automobile differentials, various industrial machines, construction machines, or machine tools, and in particular, a bearing surface or a roller rolling surface of a tapered roller bearing.
• the shape of the crowning is not limited to automobile differentials, various industrial machines, construction machines, or machine tools.
• Patent Documents 1 to 10 Many proposals have been made in the past for Crowung. Typical examples include Patent Documents 1 to 10.
• Patent Document 3 in a double-row roller bearing for a railway vehicle, the force that causes the drop amount due to crowning at the contact portion between the roller and the inner and outer rings to be larger at the bearing center side than at the bearing end side, or a large amount of rollers.
• This is an invention in which the drop amount by crowning on the small diameter side is made larger than the diameter side to make the stress distribution uniform, and it is applied to the circle and roller bearings used in the back combination .
• Patent Document 1 Noto 02554882 (Act No. 5-22845)
• Patent Document 2 Japanese Utility Model Publication No. 5-89943
• Patent Document 3 Japanese Patent Application Laid-Open No. 8-232960
• Patent Document 4 Japanese Patent Laid-Open No. 2000-257637
• Patent Document 5 Japanese Unexamined Patent Publication No. 2000-346078
• Patent Document 6 Japanese Patent Application Laid-Open No. 2001-65574 (US6390685B1)
• Patent Document 7 Japanese Patent Laid-Open No. 2001-82114 (US6311660B1)
• Patent Document 8 Japanese Unexamined Patent Publication No. 2001-124089
• Patent Document 9 Japanese Patent Laid-Open No. 2001-241446
• Patent Document 10 Japanese Patent Application Laid-Open No. 2002-235749
• Double-row roller bearings for railway vehicles are used in combination with the back, but are shown in Fig. 1 for supporting bearings used in various industrial machines, construction machines, or machine tools, including automobile differentials.
• Fig. 1 Double-row roller bearings for railway vehicles are used in combination with the back, but are shown in Fig. 1 for supporting bearings used in various industrial machines, construction machines, or machine tools, including automobile differentials.
• two tapered roller bearings 1 may be used in a front combination.
• the inner ring collar force also acts on the roller to generate a moment that acts so that the roller presses the inner ring raceway surface on the large diameter side of the roller.
• a phenomenon occurs in which stress increases at the contact portion on the large diameter side and the rolling fatigue life is shortened.
• it is possible to extend the fatigue life by applying a crowning process so that a uniform contact surface pressure distribution acts without causing edge stress at the contact part between the rollers and the bearing ring. It is necessary to plan.
• the contact surface pressure Distribution is non-uniform. If the contact surface pressure distribution is not uniform, the maximum contact surface pressure increases and the fatigue life of the bearing decreases. In particular, when rolling bearings 1 are used in various combinations of industrial machinery, construction machinery, or machine tools, including automobile differentials, the inner ring 2 and the outer ring on the large diameter side of the roller 4 are used. 3 However, the amount of interference with 4 increases, and the contact pressure increases on the large diameter side of roller 4.
• An object of the present invention is to extend the life of a bearing in a front combination tapered roller bearing with a crowning shape that can obtain a uniform contact surface pressure even if misalignment occurs.
• the tapered roller bearing according to the present invention is a tapered roller bearing in which a pair is used face-to-face, and any of the inner ring raceway surface, the outer ring raceway surface, and the roller rolling surface has a crowning.
• the shape is such that the drop amount on the small diameter side of the roller on the inner ring raceway surface, outer ring raceway surface, and roller rolling surface is smaller than the drop amount on the large diameter side of the roller.
• the crowning apex may be present on the small flange side on the inner ring raceway surface, on the small diameter side of the roller on the outer ring raceway surface, and on the small diameter side of the roller on the roller rolling surface.
• the interference amount can be more effectively prevented from increasing on the large diameter side of the roller, and the fatigue life can be extended.
• the inner ring raceway surface, the outer ring raceway surface, and the roller rolling surface are shifted.
• the central part is formed in a straight line and has crowns at both ends, and the crowning shape is the drop amount of the crowning on the small collar side on the inner ring raceway surface. Crowung drop amount force On the roller rolling surface! /, The drop amount on the small diameter side of the roller is smaller than the drop amount on the large diameter side of the roller.
• the amount of interference does not increase on the large diameter side of the roller, and when a misalignment occurs, the fatigue life can be extended with a substantially uniform contact surface pressure distribution.
• the shape of the crawling is an arc shape having a single curvature, a continuous arc shape formed by a plurality of arcs, a shape expressed by a logarithmic curve, or a shape that can be expressed by a general function It is good also as what has.
• a suitable crowning shape can be selected in accordance with the use situation of the bearing and the processing convenience.
• FIG. 1 is a longitudinal sectional view showing a general bearing device in which tapered roller bearings are used in front combination.
• FIG. 2 is a schematic diagram showing the occurrence of misalignment.
• FIG. 3 is a longitudinal sectional view in which a part of the tapered roller bearing that is applied to the first embodiment of the present invention is omitted.
• FIG. 4 is a view showing a crowning shape of the bearing.
• FIG. 5 is a diagram showing different crowning shapes.
• FIG. 6 is a diagram showing a further different crowning shape.
• FIG. 7 is a diagram showing a further different crowning shape.
• FIG. 8 is a longitudinal cross-sectional view in which a part of a tapered roller bearing that is applied to the second embodiment of the present invention is omitted.
• FIG. 9 is a view showing a crowning shape of the bearing.
• FIG. 10 is a diagram showing a crowning shape of different bearings.
• FIG. 11 is a graph showing the distribution of contact surface pressure.
• the tapered roller bearing 1 includes an inner ring 2, an outer ring 3, and a plurality of tapered rollers 4 interposed between the inner and outer rings 2 and 3.
• the inner ring 2 has a raceway surface 2a formed of a conical surface on the outer periphery, and has a large ridge 2b and a small ridge 2c on the large diameter side and the small diameter side of the raceway surface 2a, respectively.
• the outer ring 3 is formed with a raceway surface 3a having a conical surface force facing the raceway surface 2a of the inner ring 2 on the inner periphery, and is free of wrinkles.
• the tapered roller 4 has an outer periphery formed as a rolling surface 4a, and can roll between the raceway surfaces 2a and 3a. Each tapered roller 4 is placed in a pocket of a cage (not shown) and held at a predetermined interval in the circumferential direction. [0014]
• the rolling surface 4a of the tapered roller 4 has a shape having a crowning, and as shown in FIG. 4, chamfers 4aa and 4ab are obliquely formed at both ends. In the case of FIG. 3 and FIG. 4, it is a full crowding, and its crowning shape is an arc shape having a single curvature with the point O as the center.
• the apex P of the crowning that is, the contact point of the inner and outer rings 2, 3 with the raceway surfaces 2a, 3a is located on the smaller diameter side than the center C-C in the rotation axis direction of the tapered roller 4, and the drop on the smaller diameter side.
• the amount dl is smaller than the drop amount d2 on the large diameter side.
• the drop amounts dl and d2 are the distance from the tangential force of the crown apex P to the end of the crown.
• FIG. 5 is an example in which the roller rolling surface 4a has a straight portion 4ac at the center thereof, which is different from FIG. 3 and FIG.
• both end portions of the roller rolling surface 4a are formed by circular arcs having a single curvature centered on the point O !, but in the middle, they are straight portions 4ac, It is divided into two places on both ends.
• the drop amount of the crowung is the distance to the end of the imaginary extended line force crowung of the straight line portion 4ac.
• the drop amount dl on the small diameter side is smaller than the drop amount d2 on the large diameter side.
• FIG. 11 shows the inner and outer ring raceway surfaces or roller rolling surfaces of tapered roller bearings on the small ring side on the inner ring raceway surface, on the small diameter side on the outer ring raceway surface, and on the small diameter side on the roller rolling surface. This shows an example of calculating the contact surface pressure when there is a clouding apex.
• the crowning shape may be a continuous arc shape formed by a plurality of arcs.
• an arc centered at the point Ol and an arc centered at the point 02 are formed, and both arcs are smoothly continuous at the apex P of the crowning.
• the crowning apex P exists on the smaller diameter side from the center C—C of the tapered roller 4 in the rotation axis direction, and the drop amount dl on the smaller diameter side is smaller than the drop amount d2 on the larger diameter side.
• the crowning shape can also be represented by a logarithmic curve and other general functions.
• the center portion of the rolling surface may be formed in a straight line, and the crown may be formed in different arcs only at both ends of the rolling surface.
• the drop amount dl on the small diameter side is smaller than the drop amount d2 on the large diameter side.
• the contact pressure distribution can be made substantially uniform when misalignment occurs.
• FIGS. 8 to 10 show a second embodiment.
• the raceways 2a and 3a of the inner ring 2 and the outer ring 3 are provided with a crowning.
• the rolling surface 4a of the tapered roller 4 is a tapered surface.
• the raceway surfaces 2a and 3a of both the inner and outer rings 2 and 3 are full-crowned, and the crowning shape has a single curvature centered on the point Oin or the point Oout. It has an arc shape.
• Crowung vertices Pin and Pout are located on the smaller diameter side from the center C—C of the tapered roller 4 in the rotation axis direction, and both the inner ring raceway surface 2a and the outer ring raceway surface 3a have a larger drop amount dl. Also, as shown in Fig. 10, the center part of the inner ring 2 and the outer ring 3 is formed in a straight line, and the crown is only on both ends of the roller rolling surface 4a. It may be formed. In this case as well, the drop amount dl on the small diameter side is smaller than the drop amount d2 on the large diameter side.
• the crowning shape may be a continuous arc shape formed by a plurality of arcs, a shape expressed by a logarithmic curve, or a general
• the shape can be expressed by a simple function, and in this case, the same actions and effects as above can be obtained.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Rolling Contact Bearings (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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ID=38048499

Family Applications (1)

Country Status (3)

Families Citing this family (4)

Citations (3)

Family Cites Families (2)

• 2005
  • 2005-11-16 JP JP2005331545A patent/JP2007139019A/ja active Pending
• 2006
  • 2006-11-09 EP EP06823248A patent/EP1956255A4/de not_active Withdrawn
  • 2006-11-09 WO PCT/JP2006/322361 patent/WO2007058112A1/ja active Application Filing

Patent Citations (3)

Non-Patent Citations (1)

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